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Light travels in straight lines. They constitute a ray or beam of light.

1.EXPERIMENT : Take a candle. Place 3 equal sized cardboard. Make a pinhole straight to candle in the 3 card-boards. Observe through the last cardboard hole. We can see the candle light. If we shift the middle cardboard, we cannot see the candle light.

2. CONCLUSION : This proves that light travels in straight lines.

This is rectilinear propogation of light.

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Q: What is rectilinear propogation of light?
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